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Examen de Química Inorgánica:
Dadas las siguientes muestras, ordénalas, justificando la respuesta, según su masa:
2 at-g de hierro; 3 moleculas-gramos de agua;
40 litros de NH3 en C.N.; 1,8·1024 átomos de Mg .
Datos (masas): H=1 O=16 Fe=55,8 N=14 Mg=24,3
Dado el siguiente proceso: Zn + H2SO4 ® ZnSO4 + H2. Calcula:
Los gramos de Zn que reaccionan con 0,5 litros de ac. Sulfúrico 3M (M: Molaridad) Datos: Zn=65,4 H=1 S=32 O=16
¿Qué volumen de H2 en C.N. se obtiene?
Una disolución acuosa de H3PO4 contiene 300 g/l de dicho ácido, y su densidad es de 1,153 g/cm3. Calcula:
Normalidad y Molaridad.
La concentración en % en masa. Datos: H=1 P=39 O=16
4) Se dispone de una disolución de ac. Nítrico, HNO3, cuya riqueza es del 70%, y densidad 1,42 g/cm3. ¿Cuántos ml de dicha disolución serán necesarios para preparar 300 ml de dicho ácido 2,5M? Datos: H=1 N=14 O=16
5) Dado el proceso: Al2(CO3)3 + HCl ® AlCl3 + CO2 + H2O. Si tiene una muestra impura de Al2(CO3)3 que tiene de masa 13g y que origina 2.018 litros de CO2 en C.N. ¿Cuál es la pureza del Al2(CO3)3? Datos: Al=27 C=12 O=16
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Enviado por: Sonia Idioma: castellanoPaís: España